feat(dns): add db-backed DNS provider, domain, and record management with ops UI support

ts_interfaces/data/domain.ts

@@ -0,0 +1,35 @@
+/**
+ * Where a domain came from / how it is managed.
+ *
+ * - 'manual'   → operator added the domain manually. dcrouter is the
+ *               authoritative DNS server for it; records are served by
+ *               the embedded smartdns.DnsServer.
+ * - 'provider' → domain was imported from an external DNS provider
+ *               (e.g. Cloudflare). The provider stays authoritative;
+ *               dcrouter only reads/writes records via the provider API.
+ */
+export type TDomainSource = 'manual' | 'provider';
+
+/**
+ * A domain under management by dcrouter.
+ */
+export interface IDomain {
+  id: string;
+  /** Fully qualified domain name (e.g. 'example.com'). */
+  name: string;
+  source: TDomainSource;
+  /** ID of the DnsProvider that owns this domain — only set when source === 'provider'. */
+  providerId?: string;
+  /** True when dcrouter is the authoritative DNS server for this domain (source === 'manual'). */
+  authoritative: boolean;
+  /** Authoritative nameservers (display only — populated from provider for imported domains). */
+  nameservers?: string[];
+  /** Provider's internal zone identifier — only set when source === 'provider'. */
+  externalZoneId?: string;
+  /** Last time records were synced from the provider — only set when source === 'provider'. */
+  lastSyncedAt?: number;
+  description?: string;
+  createdAt: number;
+  updatedAt: number;
+  createdBy: string;
+}